Rotary-vane vacuum pump

Abstract

The invention relates to the technical field of variable-capacity mechanical pumps, in particular to a rotary-vane vacuum pump which comprises a pump shell, a rotor, rotary vanes and an adjusting frame, a pump cavity is formed in the pump shell, the rotor is eccentrically arranged in the pump cavity and can rotate around the axis of the rotor, the multiple rotary vanes are distributed in the circumferential direction of the rotor at intervals and elastically connected to the rotor, and the adjusting frame is arranged in the pump cavity. The rotary vanes can elastically slide in the radial direction of the rotor. The adjusting frame is arranged, the abrasion loss of the two side portions of the rotary vane is smaller than that of the middle portion of the rotary vane through the adjusting frame, the two side portions of the rotary vane are always attached to the inner wall of the pump cavity in a sliding mode, and therefore under the action of the inner wall of the pump cavity, the abrasion loss of the two side portions of the rotary vane is larger than that of the middle portion of the rotary vane. Therefore, the abrasion loss of the two sides and the middle part of the rotary vane is basically consistent, the problem that the rotary vane cannot be attached to the inner wall of the pump cavity is solved, and then the problem that the rotary vane cannot effectively compress air is solved.

Description

Technical Field

[0001] The invention relates to the technical field of variable displacement mechanical pumps, in particular to a rotary vane vacuum pump. Background Art

[0002] The rotary vane vacuum pump is a commonly used variable displacement vacuum pump, which achieves the suction, compression and discharge of gas by changing the volume of the pump chamber to obtain a vacuum environment. The rotary vane vacuum pump is usually composed of a pump body, a rotor eccentrically arranged in the pump body, and a plurality of rotary vanes elastically arranged in the rotor chute. The rotary vanes can slide along the chute to divide the pump chamber into multiple spaces of different volumes. When inhaling, when the rotor rotates around the first rotation direction (usually clockwise), the rotary vanes slide close to the inner wall of the pump chamber under the action of centrifugal force and spring force. At this time, the volume of the space connected to the suction port gradually increases and the pressure decreases. When the pressure of the space is lower than the gas pressure in the container being pumped, the gas enters the pump chamber through the suction port. As the rotor continues to rotate, the rotary vanes gradually bring the inhaled gas to the exhaust port. In this process, the volume of the space gradually decreases, the gas is compressed, and the pressure increases. When the pressure of the compressed gas increases to a value greater than the pressure outside the exhaust valve, the exhaust valve is pushed open and the gas is discharged out of the pump, thus completing a working cycle of the vacuum pump.

[0003] In the structure of the rotary vane vacuum pump, there is a contact point between the rotor and the top of the pump chamber, and a harmful space is formed in the area between this contact point and the exhaust port. During the rotation of the rotor, when the rotary vane rotates past the exhaust port, the gas in this part of the space cannot be discharged directly through the exhaust port, but will remain in the space and be further compressed by the rotary vane. These gases may flow back into the suction space through the tiny gap between the rotor and the pump chamber, resulting in some gas that cannot be completely discharged after each vacuuming, affecting the ultimate vacuum degree of the pump. To solve this problem, the prior art usually increases the size of the exhaust port, and discharges as much gas as possible through the exhaust port to the outside, so that as little air as possible enters the harmful space, thereby improving the ultimate vacuum degree of the pump. However, the two sides of the rotary vane along its length direction are still in contact with the pump chamber. In the long run, the wear amount of the two sides of the rotary vane will be greater than the wear amount of the middle area of ​​the rotary vane, which will cause the rotary vane to be unable to keep in contact with the pump chamber, which will also cause the rotary vane to be unable to effectively compress the air. Summary of the invention

[0004] Based on this, it is necessary to provide a rotary vane vacuum pump to address the problems existing in the current rotary vane vacuum pump, which is used to solve the problem that when the rotary vane vacuum pump is working, the wear on the two sides of the vane is greater than the wear in the middle area of ​​the vane, which causes the vane to be unable to maintain fit with the pump chamber and the vane to be unable to effectively compress the air.

[0005] The above purpose is achieved through the following technical solutions: A rotary vane vacuum pump comprises: a pump housing, in which a pump chamber is provided; A rotor, which is eccentrically disposed in the pump chamber and is capable of rotating about its axis; There are multiple rotary vanes, which are spaced apart around the circumference of the rotor and elastically connected to the rotor, and the rotary vanes can elastically slide along the radial direction of the rotor; A long slot, which is arranged on one side of the circumference of the pump chamber and extends along the length direction of the pump chamber; An adjustment frame, the adjustment frame extends along the length direction of the long slot and its two ends are arranged on the slot wall of the long slot; The adjustment frame is configured so that the straight-line distance between the middle portion and the rotor axis is smaller than the straight-line distance between the two side portions and the rotor axis; An air inlet is provided on one side of the pump housing and communicates with the pump chamber; The air outlet is arranged on the other side of the pump housing and is connected with the long slot.

[0006] Preferably, the vane and the rotor are elastically connected via an elastic force adjustment component, and the elastic force adjustment component is used to adjust the elastic force between the vane and the pump chamber.

[0007] Preferably, the elastic force adjustment assembly comprises an adjustment rod and an elastic telescopic rod, the adjustment rod is coaxially arranged inside the rotor, the adjustment rod and the rotor can rotate synchronously around the rotor axis and move relatively along the rotor axis, the adjustment rod is provided with an adjustment section, the adjustment section comprises a flat shaft section and a tapered shaft section, and the small end diameter of the tapered shaft section is the same as the diameter of the flat shaft section; The telescopic end of the elastic telescopic rod is arranged on a side of the rotary vane away from the pump chamber, and the fixed end of the elastic telescopic rod is in sliding contact with the adjustment section.

[0008] Preferably, there are multiple elastic telescopic rods arranged on the side of the rotor away from the pump chamber, and the multiple elastic telescopic rods are arranged at intervals along the length direction of the rotor; The adjusting rod is provided with a plurality of adjusting sections, and the plurality of adjusting sections correspond to the plurality of elastic telescopic rods one by one and the positions thereof are matched.

[0009] Preferably, a linear drive member is provided on the outside of the pump housing, and the linear drive member is used to drive the adjustment rod to move along its axis, thereby changing the sliding abutment position between the fixed end of the elastic telescopic rod and the adjustment section.

[0010] Preferably, the linear drive member is any one of a hydraulic rod, an electric telescopic rod or a cylinder.

[0011] Preferably, the linear drive member comprises a nut and a screw, the screw is coaxially fixedly connected to the adjustment rod, and one end of the screw passes through the pump chamber and is threadedly connected to the nut; The outer surfaces of the flat shaft section and the tapered shaft section are provided with limiting grooves, and the fixed end of the elastic telescopic rod is slidably abutted against the adjustment section through the limiting groove.

[0012] Preferably, a spline shaft is provided at one end of the adjusting rod away from the screw rod, a corresponding spline groove is provided on the rotor, and the spline shaft is slidably connected in the spline groove.

[0013] Preferably, a collecting box is further provided on the outside of the pump housing, and the collecting box is located below the middle part of the adjustment frame and is connected to the pump chamber.

[0014] Preferably, a motor is provided outside the pump housing, and an output end of the motor is coaxially connected to the rotor for driving the rotor to rotate around its axis.

[0015] The beneficial effects of the present invention are: 1. The present invention is provided with an adjustment frame. When the vane rotates with the rotor to contact with the adjustment frame, since the straight-line distance from the middle part of the adjustment frame to the rotor axis is smaller than the straight-line distance from the two side parts of the rotor to the rotor axis, the positive pressure when the adjustment frame contacts the middle part of the vane is greater than the positive pressure when the adjustment frame contacts the two side parts of the vane. Therefore, the adjustment frame can make the wear amount of the middle part of the vane greater than the wear amount of the two side parts of the vane. The two side parts of the vane are always in contact with the inner wall of the pump chamber. Therefore, the wear amount of the two side parts of the vane is greater than the wear amount of the middle part of the vane through the inner wall of the pump chamber. The two are balanced with each other, so that the wear amount of the middle part of the vane is basically the same as the wear amount of the two side parts, thereby preventing the vane from failing to fit the inner wall of the pump chamber, and further preventing the vane from failing to effectively compress the air.

[0016] 2. The present invention is provided with an elastic force adjustment component. When the elastic force between the rotor and the inner wall of the pump chamber decreases due to increased wear of the rotor and the rotor can no longer slide closely against the inner wall of the pump chamber, the positive pressure between the rotor and the inner wall of the pump chamber is adjusted by the elastic force adjustment component so that the rotor can still maintain close contact with the inner wall of the pump chamber and slide, thereby preventing the rotor from being unable to effectively compress the air. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is an overall schematic diagram of a rotary vane vacuum pump of the present invention; Figure 2 It is a right side view of a rotary vane vacuum pump of the present invention; Figure 3 for Figure 2 A cutaway stereogram of the middle AA; Figure 4 A top view of a rotary vane vacuum pump of the present invention; Figure 5 for Figure 4 Middle BB section view; Figure 6 It is a structural schematic diagram of an elastic force adjustment component in a rotary vane vacuum pump of the present invention; Figure 7 It is a right side view of an elastic adjustment assembly of a rotary vane vacuum pump of the present invention; Figure 8 for Figure 7 Middle CC section view.

[0018] in: 100, pump housing; 110, pump chamber; 120, long slot; 130, air inlet; 140, air outlet; 150, collection box; 200, rotor; 210, chute; 300, Rotary blade; 400, adjustment frame; 500, elastic force adjustment component; 510, adjustment rod; 511, flat shaft section; 512, tapered shaft section; 513, limiting groove; 520, elastic telescopic rod; 600, linear drive member; 610, nut; 620, screw; 700. Motor. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below through embodiments and in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0020] The serial numbers assigned to the components herein, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings). In the description of the present invention, it should be understood that the orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.

[0021] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0022] like Figure 1-Figure 8 As shown, a rotary vane vacuum pump includes a pump housing 100, a rotor 200, a rotary vane 300 and an adjustment frame 400. A pump chamber 110 is provided in the pump housing 100. The rotor 200 is eccentrically arranged in the pump chamber 110. The rotor 200 can rotate around its axis. There are multiple rotary vanes 300. The multiple rotary vanes 300 are distributed around the circumference of the rotor 200 at intervals and are elastically connected to the rotor 200. The rotary vanes 300 can elastically slide along the radial direction of the rotor 200. A long slot 120 is opened on one circumferential side of the pump chamber 110, and the long slot 120 is 20 extends along the length direction of the pump chamber 110, the adjustment frame 400 extends along the length direction of the long slot 120 and its two ends are correspondingly arranged on the slot wall of the long slot 120, the adjustment frame 400 is configured so that the straight-line distance from the middle part to the axis of the rotor 200 is smaller than the straight-line distance from the two side parts to the axis of the rotor 200, an air inlet 130 is opened on one side of the pump housing 100, and the air inlet 130 is connected to the pump chamber 110, and an air outlet 140 is opened on the other side of the pump housing 100, and the air outlet 140 is connected to the long slot 120.

[0023] It should also be noted that an exhaust valve should be provided in the air outlet 140. The exhaust valve is a pressure-controlled valve. When the pressure applied to the exhaust valve is greater than a preset value, the exhaust valve can be pushed open and the air in the pump chamber 110 is discharged outward through the exhaust valve.

[0024] When in use, the staff first connects the air inlet 130 to the vacuum end, connects the air outlet 140 to the exhaust end, and then rotates the rotor 200 around its axis to Figure 5, the rotor 200 rotates counterclockwise, and the vane 300 slides against the inner wall of the pump chamber 110 under the action of centrifugal force and spring force. At this time, the volume of the space connected to the air inlet 130 gradually increases, and the pressure decreases. When the pressure of the space is lower than the pressure of the gas in the vacuum container, the gas enters the pump chamber 110 through the air inlet 130. As the rotor 200 continues to rotate, the vane 300 gradually brings the inhaled gas to the direction of the air outlet 140. In this process, the volume of the space gradually decreases, and the gas is compressed. When the pressure of the compressed gas increases to a value greater than the pressure of the exhaust valve at the gas outlet 140, the exhaust valve is pushed open, and the gas is discharged from the pump chamber 110 through the gas outlet 140, thus completing a working cycle. As the rotor 200 continues to rotate, each time the vane 300 rotates with the rotor 200 to contact the adjustment frame 400, since the straight-line distance from the middle part of the adjustment frame 400 to the axis of the rotor 200 is less than the straight-line distance from the two side parts of the rotor 200 to the axis of the rotor 200, the adjustment frame 400 and the The positive pressure when the middle part of the rotary vane 300 contacts is greater than the positive pressure when the adjustment frame 400 contacts the two side parts of the rotary vane 300. Therefore, the adjustment frame 400 can make the wear amount of the middle part of the rotary vane 300 greater than the wear amount of the two side parts of the rotary vane 300, and the two side parts of the rotary vane 300 are always in contact with the inner wall of the pump chamber 110 (when the rotary vane 300 rotates to the position of the air inlet 130 and the air outlet 140, the two side parts of the rotary vane 300 are still in contact with the inner wall of the pump chamber 110, Since the middle portion of the vane 300 does not contact the inner wall of the pump chamber 110 due to the presence of the air inlet 130 and the air outlet 140, the wear amount of the two side portions of the vane 300 is greater than the wear amount of the middle portion of the vane 300 through the inner wall of the pump chamber 110, and the two are balanced with each other, so that the wear amount of the middle portion of the vane 300 is basically the same as the wear amount of the two side portions, thereby preventing the vane 300 from failing to fit with the inner wall of the pump chamber 110, and further preventing the vane 300 from failing to effectively compress the air.

[0025] It should also be noted that in order to enable the vane 300 to slide elastically in the radial direction of the rotor 200 , specifically, a slide groove 210 extending in the radial direction of the rotor 200 is provided on the rotor 200 , and the vane 300 can slide elastically in the radial direction of the rotor 200 through the slide groove 210 .

[0026] In a further embodiment, Figure 5 As shown, the vane 300 and the rotor 200 are elastically connected via an elastic force adjustment assembly 500 , and the elastic force adjustment assembly 500 is used to adjust the elastic force between the vane 300 and the pump chamber 110 .

[0027] As the working time of the rotor 300 increases, the rotor 300 is worn more and more, and the elastic force between the rotor 300 and the inner wall of the pump chamber 110 decreases, which will cause the rotor 300 to no longer be able to slide closely against the inner wall of the pump chamber 110, and further cause the rotor 300 to be unable to compress the gas. To solve this problem, an elastic force adjustment component 500 is provided between the rotor 300 and the rotor 200. The elastic force adjustment component 500 is used to adjust the positive pressure between the rotor 300 and the inner wall of the pump chamber 110, so that the rotor 300 can still maintain close contact with the inner wall of the pump chamber 110.

[0028] In a further embodiment, Figure 5-Figure 8 As shown, the elastic force adjustment component 500 includes an adjustment rod 510 and an elastic telescopic rod 520. The adjustment rod 510 is coaxially arranged inside the rotor 200. The adjustment rod 510 and the rotor 200 can rotate synchronously around the axis of the rotor 200 and move relatively along the axis of the rotor 200. An adjustment section is provided on the adjustment rod 510, and the adjustment section includes a flat shaft section 511 and a conical shaft section 512. The small end diameter of the conical shaft section 512 is the same as the diameter of the flat shaft section 511. The telescopic end of the elastic telescopic rod 520 is arranged on the side of the rotary vane 300 away from the pump chamber 110, and the fixed end of the elastic telescopic rod 520 is slidably abutted against the adjustment section.

[0029] In the initial state, the adjustment rod 510 is located at the junction of the flat shaft section 511 and the tapered shaft section 512 .

[0030] When the staff was inspecting and maintaining the equipment, they found that the positive pressure between the rotor 300 and the inner wall of the pump chamber 110 was less than a preset value. At this time, the staff moved the adjustment rod 510 along its axis to change the contact position of the elastic telescopic rod 520 with the adjustment section, so that the elastic telescopic rod 520 changed from contacting the flat shaft section 511 to contacting the conical shaft section 512. Since the small end diameter of the conical shaft section 512 is the same as the diameter of the flat shaft section 511, after the fixed end of the elastic telescopic rod 520 slides and abuts against the conical shaft section 512, the distance between the fixed end of the elastic telescopic rod 520 and the inner wall of the pump chamber 110 is reduced, and the elastic force of the elastic telescopic rod 520 is increased, thereby increasing the positive pressure between the rotor 300 and the inner wall of the pump chamber 110, and further allowing the rotor 300 to still remain in close contact with the inner wall of the pump chamber 110.

[0031] It is understandable that, as the working time increases, when the positive pressure between the rotor 300 and the inner wall of the pump chamber 110 is less than the first preset value, the staff still moves the adjustment rod 510 along its axis to make the fixed end of the elastic telescopic rod 520 slide and abut against the larger diameter part of the tapered shaft section 512, further reducing the distance between the fixed end of the elastic telescopic rod 520 and the inner wall of the pump chamber 110, so as to ensure that the rotor 300 can still maintain close contact with the inner wall of the pump chamber 110.

[0032] In a further embodiment, Figure 5-Figure 8 As shown, there are multiple elastic telescopic rods 520 arranged on the side of the rotor 300 away from the pump chamber 110, and the multiple elastic telescopic rods 520 are arranged at intervals along the length direction of the rotor 300. The adjustment rod 510 is provided with multiple adjustment sections, and the multiple adjustment sections correspond to the corresponding multiple elastic telescopic rods 520 one by one and the positions are adapted.

[0033] This configuration is to increase the support stability of the elastic force adjustment component 500 on the rotor 300 to prevent the rotor 300 from deforming along its length direction, which would cause the rotor 300 to fail to completely fit with the inner wall of the pump chamber 110 .

[0034] In a further embodiment, Figure 1 and Figure 6 As shown, a linear drive member 600 is provided outside the pump housing 100, and the linear drive member 600 is used to drive the adjustment rod 510 to move along its axis, thereby changing the sliding contact position between the fixed end of the elastic telescopic rod 520 and the adjustment section. For example, the linear drive member 600 is any one of a hydraulic rod, an electric telescopic rod or a cylinder.

[0035] When the linear drive member 600 is a hydraulic rod, Figure 8 For example, if the fixed end of the hydraulic rod is disposed on the right side of the pump housing 100, the telescopic end of the hydraulic rod is coaxially fixedly connected with the adjustment rod 510, and the adjustment rod 510 is pulled to the right by the telescopic end of the hydraulic rod, so that the fixed end of the elastic telescopic rod 520 is switched from the position abutting against the flat shaft section 511 to the position abutting against the tapered shaft section 512. When the linear drive member 600 is an electric telescopic rod or a cylinder, the same is true, and the details are not repeated.

[0036] In addition to using the above-mentioned hydraulic rod, electric telescopic rod or cylinder as the linear drive member 600, the linear drive member 600 can also be set to a manual adjustment form. Specifically, in a further embodiment, Figure 3 and Figure 6 As shown, the linear drive member 600 includes a nut 610 and a screw 620. The screw 620 is coaxially fixedly connected to the adjustment rod 510, and one end of the screw 620 passes through the inside of the pump chamber 110 and is threadedly connected to the nut 610. The flat shaft section 511 and the tapered shaft section 512 are both provided with a limiting groove 513, and the fixed end of the elastic telescopic rod 520 is slidably abutted against the adjustment section through the limiting groove 513.

[0037] When the adjusting rod 510 moves along its axis, the staff can rotate the nut 610. Under the limiting cooperation of the elastic telescopic rod 520 and the limiting groove 513, the screw rod 620 moves linearly along its axis, and the screw rod 620 drives the adjusting rod 510 to move synchronously, so that the fixed end of the elastic telescopic rod 520 switches from the position abutting against the flat shaft section 511 to the position abutting against the tapered shaft section 512.

[0038] In a further embodiment, a spline shaft is provided at one end of the adjusting rod 510 away from the screw rod 620 , a corresponding spline groove is provided on the rotor 200 , and the spline shaft is slidably connected in the spline groove.

[0039] The purpose of providing the spline shaft and the spline groove is to enable the adjustment rod 510 to rotate synchronously with the rotor 200 through the transmission cooperation of the spline shaft and the spline groove when the rotor 200 rotates, and when the adjustment rod 510 moves along its axis, the adjustment rod 510 and the rotor 200 can move relative to each other along the axis of the rotor 200. In other embodiments, a flat key can also be provided on the adjustment rod 510, and a key groove can be provided in the hole where the rotor 200 and the adjustment rod 510 cooperate. The length of the key groove is greater than the length of the flat key, and the flat key can be slidably fitted in the key groove. At this time, when the rotor 200 rotates, the adjustment rod 510 can be synchronously rotated through the mutual cooperation of the flat key and the key groove. When the adjustment rod 510 moves, the relative movement between the adjustment rod 510 and the rotor 200 along the axis of the rotor 200 can also be satisfied through the sliding cooperation of the flat key and the key groove.

[0040] In a further embodiment, Figure 3 and Figure 5 As shown, a collecting box 150 is further disposed outside the pump housing 100 . The collecting box 150 is located below the middle portion of the adjustment frame 400 and is connected to the pump chamber 110 .

[0041] When the rotary vane 300 is in sliding contact with the adjustment frame 400, the middle part of the rotary vane 300 has a relatively large positive pressure when in contact with the middle part of the adjustment frame 400, so the rotary vane 300 will be worn, and some of the worn debris will adhere to the adjustment frame 400. During operation, the adjustment frame 400 will be subjected to vibration force, and the worn debris attached to the adjustment frame 400 will fall into the collection box 150 under the action of gravity, so that the worn debris of the rotary vane 300 can be collected by the collection box 150.

[0042] It should also be noted that if Figure 3As shown, the adjustment frame 400 is a V-shaped structure, and the heights of the two ends of the adjustment frame 400 are higher than the height of the middle part of the adjustment frame 400. Therefore, the grinding chips adhered to the two ends of the adjustment frame 400 can move along the V-shaped inclined surface of the adjustment frame 400 and gather in the middle part of the adjustment frame 400, and finally be collected in the collection box 150, which is convenient for the staff to maintain and clean the equipment.

[0043] In a further embodiment, Figure 1 As shown, a motor 700 is disposed outside the pump housing 100 , and an output end of the motor 700 is coaxially connected to the rotor 200 for driving the rotor 200 to rotate around its axis.

[0044] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0045] The above-described embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the attached claims.

Claims

1. A rotary vane vacuum pump, characterized in that: include: a pump housing having a pump chamber disposed therein; A rotor, which is eccentrically disposed in the pump chamber and is capable of rotating about its axis; There are multiple rotary vanes, which are spaced apart around the circumference of the rotor and elastically connected to the rotor, and the rotary vanes can elastically slide along the radial direction of the rotor; A long slot, which is arranged on one side of the circumference of the pump chamber and extends along the length direction of the pump chamber; An adjustment frame, the adjustment frame extends along the length direction of the long slot and its two ends are arranged on the slot wall of the long slot; The adjustment frame is configured so that the straight-line distance between the middle portion and the rotor axis is smaller than the straight-line distance between the two side portions and the rotor axis; An air inlet is provided on one side of the pump housing and communicates with the pump chamber; The air outlet is arranged on the other side of the pump housing and is connected with the long slot.

2. A rotary vane vacuum pump according to claim 1, characterized in that: The vane and the rotor are elastically connected via an elastic force adjustment component, and the elastic force adjustment component is used to adjust the elastic force between the vane and the pump chamber.

3. A rotary vane vacuum pump according to claim 2, characterized in that: The elastic force adjustment assembly includes an adjustment rod and an elastic telescopic rod. The adjustment rod is coaxially arranged inside the rotor. The adjustment rod and the rotor can rotate synchronously around the rotor axis and move relatively along the rotor axis. The adjustment rod is provided with an adjustment section, which includes a flat shaft section and a tapered shaft section. The small end diameter of the tapered shaft section is the same as the diameter of the flat shaft section. The telescopic end of the elastic telescopic rod is arranged on a side of the rotary vane away from the pump chamber, and the fixed end of the elastic telescopic rod is in sliding contact with the adjustment section.

4. A rotary vane vacuum pump according to claim 3, characterized in that: There are multiple elastic telescopic rods, which are arranged at intervals along the length direction of the rotating blade; The adjusting rod is provided with a plurality of adjusting sections, and the plurality of adjusting sections correspond to the plurality of elastic telescopic rods one by one and the positions thereof are matched.

5. A rotary vane vacuum pump according to claim 3, characterized in that: A linear drive member is disposed outside the pump housing, and the linear drive member is used to drive the adjustment rod to move along its axis, thereby changing the sliding abutment position between the fixed end of the elastic telescopic rod and the adjustment section.

6. A rotary vane vacuum pump according to claim 5, characterized in that: The linear drive member is any one of a hydraulic rod, an electric telescopic rod or a cylinder.

7. A rotary vane vacuum pump according to claim 5, characterized in that: The linear drive member comprises a nut and a screw, the screw is coaxially fixedly connected with the adjustment rod, and one end of the screw passes through the pump chamber and is threadedly connected with the nut; The outer surfaces of the flat shaft section and the tapered shaft section are provided with limiting grooves, and the fixed end of the elastic telescopic rod is slidably abutted against the adjustment section through the limiting groove.

8. A rotary vane vacuum pump according to claim 3, characterized in that: A spline shaft is arranged at one end of the adjusting rod away from the screw rod, a corresponding spline groove is arranged on the rotor, and the spline shaft is slidably connected in the spline groove.

9. A rotary vane vacuum pump according to claim 1, characterized in that: A collecting box is also arranged outside the pump housing, and the collecting box is located below the middle part of the adjusting frame and is connected to the pump cavity.

10. A rotary vane vacuum pump according to claim 1, characterized in that: A motor is arranged outside the pump housing, and an output end of the motor is coaxially connected with the rotor to drive the rotor to rotate around its axis.

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